Luminescence Properties of Sm3+ doped Bi2ZnB2O7
来源期刊：JOURNAL OF RARE EARTHS2006年第4期
论文作者：Wang Jing Zhang Qiuhong Su Qiang Zhang Mei Ding Weijia
Key words：Bi2ZnB2O7; Sm3+; luminescence properties; concentration quenching; thermal quenching; rare earths;
Abstract: The phosphors of (Bi1-xSmx)2ZnB2O7 (x=0.01, 0.03, 0.05, 0.07, and 0.09) were synthesized by conventional solid state reaction. The purity of all samples was checked by X-ray powder diffraction (XRD). XRD analysis shows that all these compounds are of a single phase of Bi2ZnB2O7, indicating that the Bi3+ in Bi2ZnB2O7 can be partly replaced by the Sm3+ without the change of crystal structure. The excitation and emission spectra at room temperature show the typical 4f-4f transitions of Sm3+. The dominant excitation line is around 404 nm due to 6H5/2→4K11/2 and the emission spectrum consists of a series of lines at 563, 599, 646, and 704 nm due to 4G5/2→6H5/2, 6H7/2, 6H9/2, and 6H11/2, respectively. The optimal concentration of Sm3+ in Bi2ZnB2O7 is about 3mol% (relative to 1mol Bi3+) and the critical distance Rc was calculated as 2.1 nm. The temperature dependence of the emission intensity of Bi1.94Sm0.06ZnB2O7 was examined in the temperature range between 100 and 450 K. The quenching temperature where the intensity has dropped to half of the initial intensity is 280 K. The lifetime for Sm3+ in Bi1.94Sm0.06ZnB2O7 is fitted as a value of 0.29 and 1.03 ms.
Wang Jing1，Zhang Qiuhong1，Su Qiang1，Zhang Mei1，Ding Weijia1
(1.State Key Laboratory of Optoeletronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China)
Abstract:The phosphors of (Bi1-xSmx)2ZnB2O7 (x=0.01, 0.03, 0.05, 0.07, and 0.09) were synthesized by conventional solid state reaction. The purity of all samples was checked by X-ray powder diffraction (XRD). XRD analysis shows that all these compounds are of a single phase of Bi2ZnB2O7, indicating that the Bi3+ in Bi2ZnB2O7 can be partly replaced by the Sm3+ without the change of crystal structure. The excitation and emission spectra at room temperature show the typical 4f-4f transitions of Sm3+. The dominant excitation line is around 404 nm due to 6H5/2→4K11/2 and the emission spectrum consists of a series of lines at 563, 599, 646, and 704 nm due to 4G5/2→6H5/2, 6H7/2, 6H9/2, and 6H11/2, respectively. The optimal concentration of Sm3+ in Bi2ZnB2O7 is about 3mol% (relative to 1mol Bi3+) and the critical distance Rc was calculated as 2.1 nm. The temperature dependence of the emission intensity of Bi1.94Sm0.06ZnB2O7 was examined in the temperature range between 100 and 450 K. The quenching temperature where the intensity has dropped to half of the initial intensity is 280 K. The lifetime for Sm3+ in Bi1.94Sm0.06ZnB2O7 is fitted as a value of 0.29 and 1.03 ms.
Key words:Bi2ZnB2O7; Sm3+; luminescence properties; concentration quenching; thermal quenching; rare earths;
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